snmprealwalk

(PHP 4, PHP 5, PHP 7, PHP 8)

snmprealwalkDevuelve todos los objetos, incluyendo los identificadores respectivos incluidos en el objeto

Descripción

snmprealwalk(
    string $hostname,
    string $community,
    array|string $object_id,
    int $timeout = -1,
    int $retries = -1
): array|false

La función snmprealwalk() se utiliza para recorrer objetos SNMP, comenzando en el objeto identificado por object_id y devuelve no solo los valores sino también los identificadores de los objetos.

Parámetros

hostname

El nombre del host del agente SNMP (servidor).

community

La comunidad de lectura.

object_id

El identificador del objeto SNMP que precede al deseado.

timeout

El número de microsegundos antes del primer tiempo límite.

retries

El número de intentos en caso de que ocurra el tiempo límite.

Valores devueltos

Devuelve un array asociativo de identificadores de objetos SNMP así como sus valores en caso de éxito o false si ocurre un error. En caso de error, se emitirá una alerta de tipo E_WARNING.

Ejemplos

Ejemplo #1 Ejemplo con snmprealwalk()

<?php
print_r
(snmprealwalk("localhost", "public", "IF-MIB::ifName"));
?>

El código anterior producirá una salida similar a:

Array
      (
      [IF-MIB::ifName.1] => STRING: lo
      [IF-MIB::ifName.2] => STRING: eth0
      [IF-MIB::ifName.3] => STRING: eth2
      [IF-MIB::ifName.4] => STRING: sit0
      [IF-MIB::ifName.5] => STRING: sixxs
    )

Ver también

  • snmpwalk() - Recibe todos los objetos SNMP de un agente

add a note

User Contributed Notes 7 notes

up
1
scot at indievisible dot org
18 years ago
Since PHP doesn't have a nice snmptable-like function... here is a quick-and-dirty hack that works for me. Works on complete and sparse tables. The example oids are for the route (complete) and interface (often sparse) tables.

<?php
$a
= snmptable("10.1.1.1", "public", ".1.3.6.1.2.1.4.21") or die("error");
print_r($a);
$a = snmptable("10.1.1.1", "public", ".1.3.6.1.2.1.2.2") or die("error");
print_r($a);

function
snmptable($host, $community, $oid) {
// TODO: get original state and restore at bottom
snmp_set_oid_numeric_print(TRUE);
snmp_set_quick_print(TRUE);
snmp_set_enum_print(TRUE);

$retval = array();
$raw = snmprealwalk($host, $community, $oid) or die("snmptable: unable to walk OID $oid");

$prefix_length = 0;

foreach (
$raw as $key => $value) {
if (
$prefix_length == 0) {
// don't just use $oid's length since it may be non-numeric
$prefix_elements = count(explode('.',$oid));
$tmp = '.' . strtok($key, '.');
while (
$prefix_elements > 1) {
$tmp .= '.' . strtok('.');
$prefix_elements--;
}
$tmp .= '.';
$prefix_length = strlen($tmp);
}
$key = substr($key, $prefix_length);
$index = explode('.', $key, 2);
isset(
$retval[$index[1]]) or $retval[$index[1]] = array();
isset(
$firstrow) or $firstrow = $index[1];
$retval[$index[1]][$index[0]] = $value;
}

// check for holes in the table and fill them in
foreach ($retval[$firstrow] as $key => $tmp) {
foreach(
$retval as $check => $tmp2) {
if (! isset(
$retval[$check][$key])) {
$retval[$check][$key] = '';
}
}
}

return(
$retval);
}
?>
up
0
Anonymous
16 years ago
To check if there were any results found you have to use the empty() function. The count() function always returns a number 1 or larger.

$walk_result = snmprealwalk($machine_ip, $community, $snmpcodes['interface_names']);

if (empty($walk_result)) {
print "No network interfaces found.<br>\n";
exit(0);
}
up
0
Stephen Cope
20 years ago
Here's a way to find the uptime and number of users on a machine. (Note that uptime is the uptime of the snmpd daemon, which should be fairly close to the uptime for the host.)

<?php
$state
= snmprealwalk($host, "public", ".1.3.6.1.2.1.25.1", 50, 1);
$uptime = ereg_replace("^.*\) ([0-9]+ .*):[0-9][0-9]\.[0-9]{2}.*$", "\\1", $state['host.hrSystem.hrSystemUptime.0']);
$users = (int)ereg_replace("Gauge32: ", "", $state['host.hrSystem.hrSystemNumUsers.0']);
printf('<div class="machine"><dt>%s</dt><dd>%s</dd>', $host, $desc);
printf('<dd>up %s</dd>', $uptime);
if (
$users ) printf('<dd>%d user%s</dd>', $users, ($users > 1) ? 's' : '');
printf('</div>');
?>
up
0
Lars Troen
22 years ago
snmprealwalk indexes the values using the oid instead of an integer. This is useful when you need data that is contained in the oid as well as the value.

Here's an example for retrieving and printing vlan info:
//
// I have collected the vlan identifiers earlier from the 3com mib and they are stored in the $vlan table.
//
for($n=0;$n<count($vlan);$n++){
print $vlan[$n][id]." ".$vlan[$n][name]."<br>\n";
$ifStackStatusTable=@snmprealwalk($switch, $community, ".1.3.6.1.2.1.31.1.2.1.3.".$vlan[$n][id]); // ifMIB.ifMIBObjects.ifStackTable.ifStackEntry.ifStackStatus
for(reset($ifStackStatusTable); $port = key($ifStackStatusTable); next($ifStackStatusTable)){
print "$port=$ifStackStatusTable[$port]<br>";
}
up
-1
aleksander dot sztramski at kpsi dot pl
15 years ago
If you wish to use version 2c or 3, use the following functions:

snmp v2c functions:

snmp2_get (string host, string community, string object_id [, int timeout [, int retries]])
snmp2_getnext (string host, string community, string object_id [, int timeout [, int retries]])
snmp2_walk (string host, string community, string object_id [, int timeout [, int retries]])
snmp2_real_walk (string host, string community, string object_id [, int timeout [, int retries]])
snmp2_set (string host, string community, string object_id, string type, mixed value [, int timeout [, int retries]])

snmp v3 functions:

snmp3_get (string host, string sec_name, string sec_level, string auth_protocol, string auth_passphrase, string priv_pr)
snmp3_getnext (string host, string sec_name, string sec_level, string auth_protocol, string auth_passphrase, string pri)
snmp3_walk (string host, string sec_name, string sec_level, string auth_protocol, string auth_passphrase, string priv_p)
snmp3_real_walk (string host, string sec_name, string sec_level, string auth_protocol, string auth_passphrase, string p)
snmp3_set (string host, string sec_name, string sec_level, string auth_protocol, string auth_passphrase, string priv_pr)
up
-1
railson at amixsi dot com dot br
18 years ago
Attention: timeout is in microseconds (multiply by 1,000,000 for seconds)
up
-2
scot at indievisible dot org
18 years ago
Some improvements based on testing a lot of OIDs on a lot of devices.

<?php
function snmptable($host, $community, $oid) {
// TODO: get original state and restore at bottom
snmp_set_oid_numeric_print(TRUE);
snmp_set_quick_print(TRUE);
snmp_set_enum_print(TRUE);

$retval = array();
$raw = snmprealwalk($host, $community, $oid);
if (
count($raw) == 0) return ($retval); // no data

$prefix_length = 0;
$largest = 0;
foreach (
$raw as $key => $value) {
if (
$prefix_length == 0) {
// don't just use $oid's length since it may be non-numeric
$prefix_elements = count(explode('.',$oid));
$tmp = '.' . strtok($key, '.');
while (
$prefix_elements > 1) {
$tmp .= '.' . strtok('.');
$prefix_elements--;
}
$tmp .= '.';
$prefix_length = strlen($tmp);
}
$key = substr($key, $prefix_length);
$index = explode('.', $key, 2);
isset(
$retval[$index[1]]) or $retval[$index[1]] = array();
if (
$largest < $index[0]) $largest = $index[0];
$retval[$index[1]][$index[0]] = $value;
}

if (
count($retval) == 0) return ($retval); // no data

// fill in holes and blanks the agent may "give" you
foreach($retval as $k => $x) {
for (
$i = 1; $i <= $largest; $i++) {
if (! isset(
$retval[$k][$i])) {
$retval[$k][$i] = '';
}
}
ksort($retval[$k]);
}
return(
$retval);
}
?>
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